Eight white kings and one red king on a 3 X 3 chessboard. G.f.: (1 + x)/(1 - 2*x - 9*x^2 - 2*x^3).
A179604
Eight white kings and one red king on a 3 X 3 chessboard. G.f.: (1 + x)/(1 - 2*x - 9*x^2 - 2*x^3).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =59a(4) =259a(5) =1079a(6) =4607a(7) =19443a(8) =82507a(9) =349215a(10) =1479879a(11) =6267707a(12) =26552755a(13) =112474631a(14) =476459471a(15) =2018296131a(16) =8549676763a(17) =36216937647a(18) =153417558423a(19) =649886909195
External references
- oeis: A179604